Volvo RWD 700 Forum

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Do 700's have a heater control valve? 700

posted by  someone claiming to be will on  Fri Dec 17 16:41 CST 2004 [RELATED]

I have an 85 760 turbo. In the morning if I let the car warm up it will usually produce heat when warm. A few mornings I take off and the car will warm up while driving. No warm air comes out even though the engine is warm. About 20 minutes of driving I finally get heat. I believe I replaced the water valve in the engine compartment last year.
Will








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Do 700's have a heater control valve? 700

posted by  NJC on  Sat Dec 18 18:22 CST 2004
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last visit: Sun Jul 24 13:42 CST 2011
[RELATED]

Check thermostat too...start up car when cold and hold onto top rad hose. If you feel it heat up right away then you know the thermostat is stuck open.
--
Norm Cook Vancouver BC; 1989 745T 202,000KM








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Do 700's have a heater control valve? 700

posted by  someone claiming to be tom108 on  Sat Dec 18 11:09 CST 2004 [RELATED]

if you live in a cold country ,it may be possible that the thermostat is stuck at open.








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Do 700's have a heater control valve? 700

posted by  someone claiming to be frankford on  Fri Dec 17 17:31 CST 2004 [RELATED]

yes it does, locate the heater hoses going into your heater core and you will see the valve on the upper heater hose.








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Do 700's have a heater control valve? 700

posted by  someone claiming to be will on  Sat Dec 18 01:51 CST 2004 [RELATED]

Behind the dash? Not the valve in the engine compartment right?
Thanks,
Will








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Do 700's have a heater control valve? 700

posted by  someone claiming to be Chris in Calgary on  Sat Dec 18 05:40 CST 2004 [RELATED]

The valve in the engine compartment is the only water control valve. All other controls affect air flow only. They are worked by vacuum motors run by a system of very small vacuum tubes. It's possible you have an issue with one of those. Try blocking the water control valve (on the heater hose) wide open and see what happens.







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